Tilt window balances stick

A quick learner from NH says:
Hi
The window balances stick. Try to tilt the carrier into the bracket but the don't catch. Not sure if if they need changing. If we do what type are the balances
I can probably replace them my self if needed
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Emily from SWISCO responded:

Hello there!

This looks like our S751-25 with a 24HD stamp option, but I can't make out the design of your shoe. Remove your balance from the window and make sure it has the shoe that comes attached to the S751 balance, our 15-014. If it doesn't look the same or if you're unsure, remove the shoe from the window and show us. 

A quick learner from NH says:
Hello I did watch your video and I can't take the interior jam liner out since there are any screws to remove it. Can I take both sashes out and remove the whole liner and put a brand new liner in its place. Here's a picture of a better stamp
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Emily from SWISCO responded:

Ah I see. You will actually have to remove both sashes. Removing them should help let you get them out. 

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